[FPSPACE] 100 Years Since Tunguska

[Jakob Terweij]

try also this one(you know I like original sources) English is also  
available but the news is backward from 2007 in Russian its from  
yesterday.
http://www.evenkya.ru/rus/?id=uniq&sid=intmesta&ssid=1


Quoting LARRY KLAES <ljk4 at msn.com>:

> 100 YEARS SINCE TUNGUSKA
>
> Monday, June 30 marks the 100th anniversary of the Tunguska incident in
> 1908, in which a meteor or comet fragment entered the atmosphere over
> Tunguska in Siberia producing an enormous explosion.
>
>      http://en.wikipedia.org/wiki/Tunguska_event
>
> "We know that a rather massive body flew into the atmosphere of our
> planet," said Boris Shustov of the Russian Academy of Sciences.
>
> "It measured 40 to 60 meters in diameter. Clearly, it did not consist
> of iron, otherwise it would have certainly reached the earth. The body
> decelerated in the atmosphere, the deceleration being very abrupt, so
> the whole energy of this body flying with a velocity of more than 20
> meters per second was released, which resulted in a mid-air explosion,
> very similar to a thermonuclear blast," he told Tass news agency
> yesterday.
>
> "The yield of the explosion totaled 10 to 15 megatons, which matches
> the yields of the largest hydrogen bomb ever tested on the planet. The
> explosion felled some 80 million trees [but] it is generally assumed
> that the blast did not kill any people," he added.
>
> "The Tunguska phenomenon showed that the asteroid-comet danger is quite
> real. It happened not in the era of dinosaurs, but in our recent
> history. Russia was definitely lucky; had the body flown up to the
> Earth several hours later, it would have hit St.Petersburg. The
> consequences would have been horrendous," he said.
>
> "Impacts such as the Tunguska incident are thought to occur about once
> in one hundred years based on the density of impact craters on the
> Moon," according to a White Paper on Planetary Defense attached to the
> 1994 U.S. Air Force report Spacecast 2020.
>
>   http://www.fas.org/spp/military/docops/usaf/2020/app-r.htm
>
> A 2007 NASA summary report to Congress on planetary defense is here:
>
>    http://www.nasa.gov/pdf/171331main_NEO_report_march07.pdf
>
> A longer account is here:
>
>    http://www.b612foundation.org/papers/NASA-finalrpt.pdf
>
>
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Jakob Terweij
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